package com.zq.qingzhu.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class NumberUtil {

	private NumberUtil() {
	}

	/**
	 * 判断是否为11位电话号码
	 *
	 * @param phone
	 * @return
	 */
	public static boolean isPhone(String phone) {
		Pattern pattern = Pattern.compile("^((13[0-9])|(14[5,7])|(15[^4,\\D])|(17[0-8])|(18[0-9]))\\d{8}$");
		Matcher matcher = pattern.matcher(phone);
		return matcher.matches();
	}

	/**
	 * 生成指定长度的随机数
	 *
	 * @param length
	 * @return
	 */
	public static int genRandomNum(int length) {
		int num = 1;
		double random = Math.random();
		if (random < 0.1) {
			random = random + 0.1;
		}
		for (int i = 0; i < length; i++) {
			num = num * 10;
		}
		return (int) ((random * num));
	}

	/**
	 * 生成订单流水号
	 *
	 * @return
	 */
	public static String genOrderNo() {
		StringBuffer buffer = new StringBuffer(String.valueOf(System.currentTimeMillis()));
		int num = genRandomNum(4);
		buffer.append(num);
		return buffer.toString();
	}
}
